Class SRP

public byte[] computeX(byte[] s,
                       String user,
                       byte[] p)
            throws UnsupportedEncodingException

public byte[] computeX(byte[] s,
                       String user,
                       String password)
            throws UnsupportedEncodingException

public byte[] digest(byte[] src)

Convenience method to return the result of digesting the designated input with a new instance of the SRP message digest algorithm.

Parameters:

src - some bytes to digest.

Returns:

the bytes constituting the result of digesting the designated input with a new instance of the SRP message digest algorithm.

public byte[] digest(String src)
            throws UnsupportedEncodingException

Convenience method to return the result of digesting the designated input with a new instance of the SRP message digest algorithm.

Parameters:

src - a String whose bytes (using US-ASCII encoding) are to be digested.

Returns:

the bytes constituting the result of digesting the designated input with a new instance of the SRP message digest algorithm.

Throws:

UnsupportedEncodingException - if US-ASCII charset is not found.

public byte[] generateKn(byte[] K,
                         byte[] cn,
                         byte[] sn)

public byte[] generateM1(BigInteger N,
                         BigInteger g,
                         String U,
                         byte[] s,
                         BigInteger A,
                         BigInteger B,
                         byte[] K,
                         String I,
                         String L,
                         byte[] cn,
                         byte[] cCB)
            throws UnsupportedEncodingException

public byte[] generateM2(BigInteger A,
                         byte[] M1,
                         byte[] K,
                         String U,
                         String I,
                         String o,
                         byte[] sid,
                         int ttl,
                         byte[] cIV,
                         byte[] sIV,
                         byte[] sCB)
            throws UnsupportedEncodingException

public String getAlgorithm()

Returns:

the message digest algorithm name used by this instance.

public static SRP instance(String mdName)

Returns an instance of this object that uses the designated message digest algorithm as its digest function.

Returns:

an instance of this object for the designated digest name.

public IMessageDigest newDigest()

Returns a new instance of the SRP message digest algorithm --which is SHA-160 by default, but could be anything else provided the proper conditions as specified in the SRP specifications.

Returns:

a new instance of the underlying SRP message digest algorithm.

Throws:

RuntimeException - if the implementation of the message digest algorithm does not support cloning.

public byte[] xor(byte[] a,
                  byte[] b)

Convenience method to XOR N bytes from two arrays; N being the output size of the SRP message digest algorithm.

Parameters:

a - the first byte array.

b - the second one.

Returns:

N bytes which are the result of the XOR operations on the first N bytes from the designated arrays. N is the size of the SRP message digest algorithm; eg. 20 for SHA-160.